Manganites La_0.93K_0.07Mn_1−x Cu _x O₃ prepared by the solid state reaction method at high temperature, were studied structurally and magnetically. The unit cell parameters, as well as bond length and the bond angle , were determined from the Rietveld refinement of the x-ray diffraction patterns. The Fourier-transform infrared spectroscopy analysis shows that Cu²⁺ substitution induces variations in the vibration modes of the MnO₆ octahedra. Magnetization vs. temperature at low magnetic field were performed in the range under field coolingand zero field cooling conditions. All the samples exhibited a second-order paramagnetic–ferromagnetic (FM) transition at Curie temperature, , in the range between 199 and 285 K. The inverse susceptibility, exhibits a linear Curie-Weiss (C-W) behavior for , while for , it shows a deviation from the linear behavior predicted by the Heisenberg model. The mentioned deviation of means that a short ferromagnetic state formation is present even for , which were characterized by the experimental effective magnetic moment, A null spontaneous magnetization, above was evaluated for all samples by using the Kouvel-Fisher method. This work evaluates the short-range FM clusters by means of an extension of the C-W approach to the region, i.e., . Finally, the critical coefficient values, and , showed that the 3D Heisenberg model fits adequately the and samples, while the 3D Ising model fits the sample.

在结构和磁性上研究了通过高温固态反应法制备的锰La _0.93 K _0.07 Mn _{1- x} Cu _x O ₃。单位晶胞参数，以及键长和键角，是根据X射线衍射图的Rietveld精修确定的。傅立叶变换红外光谱分析表明，Cu ²⁺取代引起MnO ₆八面体振动模式的变化。在低磁场下进行磁化强度与温度的关系 在野外冷却和零野外冷却条件下。所有的样品在居里温度显示出二阶顺磁性铁磁（FM）过渡，在逆易感性199和K. 285之间的范围内，显示出用于线性居里-外斯（CW）的行为，而，它示出了与海森堡模型预测的线性行为的偏差。所提到的偏差的装置，一个短铁磁态的形成是本即使对，将其特征在于所述的实验有效磁矩，空自发磁化，上述使用Kouvel-Fisher方法对所有样品进行了评估。这项工作通过将CW方法扩展到该区域（即）来评估短程FM群集。最后，临界系数值和表示3D Heisenberg模型足够适合和样本，而3D Ising模型适合样本。